Is your 2006-2009 Buick LaCrosse suffering from frustrating transmission problems like harsh shifts, delayed gear engagement, or getting stuck in limp mode? You’re not alone. The Transmission Control Module (TCM) is the brain of your automatic transmission, and when it fails, it can make your car feel unreliable and unsafe. Instead of paying for expensive diagnostics and programming fees at a dealership, get a permanent solution with our pre-programmed T42 TCM, part number 24235732.
This isn’t just a replacement part; it’s a complete, ready-to-install fix. We take your vehicle’s VIN and program the module with the latest GM software updates before it ships. This ensures it communicates perfectly with your LaCrosse’s engine computer and other systems right out of the box. For the DIY mechanic or professional shop, this means no special scan tools are needed for setup. You can restore crisp, smooth shifting and clear those persistent transmission codes in your own garage.
Case Study: A Tricky Diagnosis
A customer brought in a 2008 Buick LaCrosse with a complaint that was driving them crazy: intermittent, bone-jarring shifts, but only after the car was fully warmed up. They’d also get a random check engine light with a P0700 (Transmission Control System Malfunction) code that would disappear on its own. We checked the fluid, scanned the solenoids, and everything looked fine mechanically. After seeing this pattern hundreds of times on GM vehicles of this era, I suspected the TCM. Heat soak was causing an internal connection to fail. We installed one of our VIN-programmed modules, and the problem was solved instantly. The customer saved hundreds compared to the dealership quote and got their smooth, predictable ride back.
Is Your Buick LaCrosse Showing These Signs?
- ✔ Unpredictable, harsh, or slamming gear shifts.
- ✔ The vehicle feels stuck in one gear (often 2nd or 3rd) and won’t shift up or down.
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750-series solenoid codes, or communication errors.
- ✔ A noticeable delay when shifting from Park into Drive or Reverse.
- ✔ Poor fuel economy and a feeling of lost power.
A Straightforward Guide to Installation
Installing your new 2006-2009 LaCrosse TCM is a simple job that can be done in under 30 minutes with basic hand tools. On the LaCrosse, you’ll find it located under the lower air cleaner housing.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Access the Module: Remove the air cleaner assembly to get a clear view of the TCM.
- Disconnect and Remove: Carefully unplug the electrical connectors. Use a small screwdriver to gently release the locking tabs if needed. Then, unbolt the old module from its mounting bracket.
- Install the New TCM: Bolt the new, pre-programmed module into place and securely reconnect the electrical harnesses. You’ll hear a click as they lock in.
- Final Steps: Reinstall the air cleaner assembly and reconnect the battery. Start the vehicle and allow it to idle for a few minutes to complete the relearn process. Any stored codes should be cleared.
Verified Vehicle Compatibility
This module is a direct-fit replacement for the 2006-2009 LaCrosse TCM and is also compatible with a wide range of other GM vehicles. It interchanges with part numbers including 24252114, 24234503, 24235732, and others. Please verify your vehicle in the fitment list below:
- Buick LaCrosse (2006-2009): Transmission; (lower air cleaner housing)
- Buick Allure (2006-2009): Transmission; (lower air cleaner housing)
- Chevrolet Impala (2006-2011): Transmission; (lower air cleaner housing)
- Chevrolet Monte Carlo (2006-2007): Transmission; (lower air cleaner housing)
- Pontiac Grand Prix (2006-2008): Transmission; (lower air cleaner housing)
- …and many other GM cars, trucks, and SUVs. Please see the full fitment chart.
Frequently Asked Questions
Why is VIN programming so important?
VIN programming loads your vehicle’s specific software onto the TCM. This ensures it works correctly with your engine, transmission type, and options. Without it, the module won’t function, leading to shifting problems or a no-start condition. Our service saves you a mandatory trip to the dealer.
Is this part difficult to install myself?
Not at all. For a 2006-2009 Buick LaCrosse, the TCM is located under the air cleaner box. It’s a simple bolt-off, bolt-on process with electrical connectors that only fit one way. Most DIYers can complete the job in under 30 minutes with basic tools.
Will this fix a P0700 trouble code?
Yes. A P0700 code is a general fault code indicating the TCM has detected a problem. Often, the problem is the TCM itself. Replacing a faulty module with our pre-programmed unit is a very common and effective way to resolve this and related transmission codes.
What kind of warranty is included?
This module comes with a one-year, hassle-free warranty. We stand behind the quality of our parts and programming to give you peace of mind with your repair.
Do I need to return my old part?
No. There is no core charge for this part. You can keep or dispose of your old module without any extra hassle or fees.